Cheng Xianhao, Peterkin Earl, Burlingame Gary A
Bureau of Laboratory Services, Philadelphia Water Department, 1500 E. Hunting Park Ave., Philadelphia, PA 19124, USA.
Water Res. 2005 Oct;39(16):3781-90. doi: 10.1016/j.watres.2005.07.009.
Volatile organic sulfide (VOS) causes of odors were studied at Philadelphia's Northeast Water Pollution Control Plant between September 11 and November 25, 2003. Results showed that dimethyl sulfide (DMS) dominated the VOS pool whenever VOS concentration rose above the background level (<50 microg/L). Methanethiol was generally less than 10% of VOS and it was mainly found at sites with limited or reduced dissolved oxygen (DO). Dimethyl disulfide occupied approximately 1% of the VOS and was often not detectable. Carbon disulfide was not detected. The concentrations of DMS varied by three orders of magnitude, ranging from <5 to 1260 microg/L. High concentrations of DMS, averaging 419 and ranging from <5 to 1000 microg/L, were generally found in return activated sludge. The DMS concentration in the primary effluent ranged from <5 to 729 microg/L and averaged 245 microg/L. Concentrations of DMS in the aeration tank (AT) with high DO were from <5 to 997 microg/L with an average of 250 microg/L. However, DMS concentrations in the AT representing anaerobic conditions were as high as 1260 microg/L. The estimated average purge efficiency of DMS was about 78%, which required a DMS production rate of 108 microg/Lh(-1) to keep the analyzed concentration in the AT. While a valid but weak statistical relationship between acetone and DMS was observed, there was no strong evidence to support that the methylation of hydrogen sulfide with acetone could be the mechanism for the DMS formation. Instead, DMS production was found to be associated with the characteristics of incoming wastewater. Thus, a VOS precursor was believed to be present in the incoming wastewater, which warranted a need for further investigation.
2003年9月11日至11月25日期间，在费城东北水污染控制厂对挥发性有机硫化物（VOS）产生气味的原因进行了研究。结果表明，每当VOS浓度升至背景水平（<50微克/升）以上时，二甲基硫醚（DMS）就在VOS总量中占主导地位。甲硫醇通常占VOS的比例不到10%，主要存在于溶解氧（DO）有限或降低的区域。二甲基二硫醚约占VOS的1%，通常无法检测到。未检测到二硫化碳。DMS的浓度变化幅度达三个数量级，范围从<5至1260微克/升。高浓度的DMS平均为419微克/升，范围从<5至1000微克/升，通常在回流活性污泥中发现。初沉池出水的DMS浓度范围为<5至729微克/升，平均为245微克/升。溶解氧含量高的曝气池（AT）中的DMS浓度范围为<5至997微克/升，平均为250微克/升。然而，代表厌氧条件的曝气池中的DMS浓度高达1260微克/升。DMS的估计平均吹扫效率约为78%，这需要108微克/升·小时-1的DMS产生速率才能维持曝气池中分析出的浓度。虽然观察到丙酮与DMS之间存在有效但较弱的统计关系，但没有有力证据支持丙酮与硫化氢甲基化可能是DMS形成的机制。相反，发现DMS的产生与进水废水的特性有关。因此，据信进水废水中存在VOS前体，这需要进一步调查。
